Electron Collisional Excitation Rates for Atoms and Ions of Astrophysical Interest

Details Electron Collisional Excitation Rates for Atoms and Ions of Astrophysical Interest Electron Collisional Excitation Rates for Atoms and Ions of Astrophysical Interest

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20518207t&link_type=abstract

American Astronomical Society Meeting 205, #182.07; Bulletin of the American Astronomical Society, Vol. 37, p.388

Astronomy and Astrophysics

Astrophysics

Scientific paper

Accuracy and completeness of atomic data play a critical role in modeling of the astrophysical plasmas to understand a variety astrophysical sources ranging from solar system to external galaxies. Electron collisional excitation rates and transition probabilities are important for computing plasma electron temperatures and densities, ionization equilibria, and for elemental abundances from emission lines formed in the collisional and photoionized plasmas. Electron impact collision strengths and rates for neutral carbon, nitrogen, oxygen, sulfur and chlorine have been calculated using B-spline R-matrix approach. Accurate representation of both the target state wavefunctions and the R-matrix basis functions has been obtained on the basis of non-orthogonal orbitals. The Breit-Pauli R-matrix approach has been used to compute collision strengths and rates for a number of ions for transitions giving rise to lines from optical to X-ray spectral regimes. Sufficient number of spectroscopic target states and pseudo-states have been included in close-coupling expansions to account for all important couplings as well as to produce rates for all relevant cascade transitions. New results of oscillator strengths and collision strengths for N I, O IV, S X and Fe XIV will be presented. This research work has been supported by NASA.

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